Garage air compressor



G. 5.. HAZARD GARAGE m COMPRESSOR.

APPLICATION. FILED NOV 15. 1920.

Patented Aug. 22, 1922.

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GARAGE AIR GOMIPRESSQR.

enace.

Specification of Letters Patent.

Patented Aug, 22,1922.

Application filed November 15, 19cc. Serial 1%. 424,153.

' citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, haveinvented certaln new and useful Improvements in Garage Air f Compressors, of which the following is a specification, reference being had therein t the accompanying drawlng.

This invention relates to improvements in garage air compressors, and is adapted to be used either as a fixed unit in the garage, or be mounted on wheels and moved around.

The primary object of my present improvement is toprovide a driving gear hous ing having abase oil-well for lubricating the driving gears and a relatively elevated oil-supply or well receiving oil splash from the gears, to supply lubrication to the movable parts of the pump, including thepiston, main bearing and connecting rod bearing.

Further objects of the invention will appear from the following description.

In the accompanying drawings:

Figure 1 is a vertical central section of an air-pump showing my present improvements.

Figure 2 is a detached sectional view, showing a modification in the construction of an oil retainer, carried by a motor shaft.

My improved garage compressor comprises any suitable form of electric motor 1, which is provided with a projecting drive shaft 2. I y

My improved pump construction comprises a housing having a vertical gear portion 3 and a pump portion 4, including a crank shaft case or housing 5. suitable pump cylinder 6 is mounted on the crank case 5 and within this cylinder 6 is a suitable piston 7. Located in the housing is an,

elongated main pump shaft bearing 8, in which a pump shaft 9 rotates. The main shaft 9 is provided with a crank arm 10 carrying a connecting. rod bearing 11, to which the lower end 12 of a connecting rod 1.3 .is

The end of the pump shaft 9, opposite the crank arm 10, carries a gear 17 which meshes with a pinion 18, carriedon the projecting end of the motor shaft 2.

The gear 17 dip'sinto-the main oil supply well 1 9 at the bottom of the gear housing 3,

,and the rotation of the gear splashes the oil and someof it is thrownon the top of the main pump shaft bearing 8, for lubricating the shaft 9, by passing through a suitable opening or openings 20, made through the bearing, and at the same time the oil at the top of the bearing 8 provides lubrication for the piston 7. The manner here shown of supplying lubrication for the piston 7, from the top of the main bearing 8, is by means of a wick 21. which rests on the top of the main bearing and is connected with a lubri Y eating pad 22 cyllnder 6 in the path traveledby the piston 7. This pad 22 rests upon a baflie plate 23, which is located at the bottom of the cylinder 6.

Preferably the top of the main bearin 8 is provided with a. vertical wall 24:, which forms an oil receiving well 25 on top of the main bearing and in which the lower end of the wick 21 is located. vAn opening 26 connects the bottom of the crank case 5,. with v the oil supply well 19 of the gear housing.

. In operation, the gears splash the oil from the oil supply well 19 and some of it is thrown into or flows down the wall of the housing into the oil well 25, on top of the main bearing, and the oil passes through the located at the bottom of the opening 20 furnishing ample lubrication for the pump shaft 9, some of the oil find-- ing its way to the crank end of the shaft for lubricating the lower end of the connecting rod and any surplus is thrownin the crank case and against the underside of the baflle plate 23, and the surplus finds its we to the bottom of the crank case and flows bac to the oil supply well 19, through the open ing 26.

Attentionis directed to the fact that the projecting, end 2 of the motor shaft passes through an opening 27 in the gear housing and is out of contact both with the wall of I p the openin and an inwardly extending flange or co lar 28. The shaft 2 is provided 'with an outwardly tapered portion 29,

which terminates in a ointed flange 30 adjacent the pinion 18.1 y this construction oil is prevented from flowin outside of the housing without the use 0 a stuffing box which is usually used for this purpose, By

omitting the stufiing box I eliminate the means for preventing the splashed" oil of bottom of the 'side of the pinion 18.

. and

the gear housing from running to the outside ,thereof by omittingthe pointed flange 30 and having a taper 29 extending to the For the purpose of permitting access to the ear housing, its top 31 is removed l ield in place by suitable bolts 32.

As here shown, the gear housing 3 is made integral with a base 33 on top of which the motor 1 is suitably bolted. 1

I desire it to be understood that modifications and variations may be made in-the specific construction here shown without departing from the spirit and scope of the invention as defined in the appended claims.

By the construction here shown and described, a circulation of lubricant is provided from the supply well 19, through the 'main shaft bearing to .the crank shaft and its connecting rod bearing, the baflle plate at the bottom of the cylinder preventing the oil beingthrown into the cylinder to prevent excess lubrication, therein, the oil falling to the bottom of the crank case and flowing back to the oil supply well 19, at the ear housing.

The lubricatlng pad 22 at the bottom of the cylinder provides efiicient lubrication for the piston and the cylinder, but prevents excess lubrication which is essential to avoid the oil mixing with the compressed air,-

and oil thereby reaching the rubber of the tire and decomposing the rubber.

l he oil levelin the oil well 25 which is located at the top of the main bearing 8, is determined by the height of its wall 24,

. which is here shown substantially on a level with the lubricating pad 22.

. Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. A motor driven air compressor, comprising a gear housing having an oil well at its bottom and a pump shaft bearing in com bination with a 'crank case having its bottom above and in communication with the gear case oil-well, whereby the gear oil splash lubricates the main shaft bearing and any excess oil passing into the crank case flows back into the gear case oil well for the purpose of keeping the crank case dry from 2. A motor driven a1r compressor, comprisin a gear housing having an oil well at its bottom and a main pump shaft bearing having an opening in communication with the ear housing, in combination with eas es a crank case-having its bottom in communication withthe gear case oil' well, a

. and any excess in the crank case flows back into the gear case oil well for the purpose of keeping the crank case dryf'rom oil.

3. An air compressor, comprising a gear case and a main pump shaft bearing in com-' bination with a crank case, a cylinder mounted thereabove, a pump shaft in the main bearing operatively connected with a piston within the cylinder, an oil supply well at the bottom of the housing, a gear in the housin and extending into the oil well and splashing oil ontop of the main bearin%,th e pump shaft and the piston receiving lu rication only from the top of the main bearing.

l. A motor driven air compressor, com

prising a main pumpshaft bearing, a gear ousing at one;si de thereof and a crank case I at the opposite side of the.bearing,'the bottom of the housing having anv oil supply well, a cylinder mounted on the crank case, a pumpzshaft in the main bearing, a piston in the cylinder operatively connected with the pump shaft, a gear within the housing connected with the pump shaft and extending into the oil well, means supplied ifrom the top of the main bearingfor supplying the piston lubrication, whereby the splash from the gear oils the main shaft bearing andflthe piston.

5. A motor driven air compressor, comprising a main shaft bearing, a gear housing at one side of the bearing'and a crank case at the opposite side of the bearing, an open.

top oil well at the top of the main bearing and in communication with the main bearing, a pump shaft in the main bearing, a cylinder on the crankcase, a piston in the cylinder operatively connected with the pump shaft, a gear in the'housing carried by the pump shaft and extending into the 011 well of the housing, a cylinder and main bearing in communication with the main bearing oil well, the parts operating as described.

6. A motor driven. air compressor, comprising a main bearing having an open top oil well on, its top, a gear housing 'at. one side of the bearin in communication with the oil well, a cy inder in communication with the oil well, a piston in the cylinder,

pump shaft in the main bearing operatively connected with the piston, a gear housing having an oilsupply well, a gearcarried by the shaft and projecting into the oil well, whereby the splash from the gear supplies oil to the main shaft oil well for lubricating the pump shaft and the piston. I

V 7 A 01 01 driven air compressor, comprising a main shaft bearing having an oil Well at'its top, a gear housing at one side of the bearing and in comniunication with the said oil well, a crank case at the opposite side of the main bearing, a cylinder on the crank case, a piston in the cylinder, a pump shaft operatively connected withthe piston, a Wick in the oil well in communication with the cylinder, a gear in'the-houswhereby the splash from the gear supplies oil to the main bearing aforesaid main shaft oil well for oiling the and the piston through the wick. I

In testimony whereof I hereunto afiix my signature.

GEORGE EDGAR HAZARD. 

